Aetna CEO: Obamacare In A 'Death Spiral' Heading Into 2018. Aetna and Humana have called off their deal amid government concerns over competition. Here's a look back at six pivotal moments that led to this. Aetna and Humana have called off their deal amid government concerns over competition.
For the plant genus, see Synapsis (plant). Synapsis (also called syndesis) is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
Referenced in 1 quiz question. During transmission across a chemical synapse: the neurotransmitter is released, causing the postsynaptic ion channels to open., All of these., gap junctions block current from traveling from one cell to the next., or sodium ions hyperpolarize the post-synaptic cell membranes.eferenced in 1 quiz question. During transmission across a chemical synapse: the neurotransmitter is released, causing the postsynaptic ion channels to open., All of these., gap junctions block current from traveling from one cell to the next., or sodium ions hyperpolarize the post-synaptic cell membranes.